I like the stock keyboard. It is perfect in predicting text while typing. Many of my friends find this keyboard mind blowing as they have to download keyboard to have gesture typing which is by default available on my Lumia.

It would be nice to have options, but so far the stock keyboard is better than most keyboards I've seen. So much more accurate than the iPhone stock keyboard for example, and the predictions are almost always spot on, both in English and in Dutch.